CN202425146U - A driving circuit for an LED lighting device - Google Patents
A driving circuit for an LED lighting device Download PDFInfo
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- CN202425146U CN202425146U CN 201220007395 CN201220007395U CN202425146U CN 202425146 U CN202425146 U CN 202425146U CN 201220007395 CN201220007395 CN 201220007395 CN 201220007395 U CN201220007395 U CN 201220007395U CN 202425146 U CN202425146 U CN 202425146U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a LED lighting device drive circuit, its input links to each other with AC power supply, and the output is connected to LED lighting device, including rectification filter circuit, PFC control circuit, sampling circuit, rectification filter circuit's input links to each other with AC power supply, and rectification filter circuit's output links to each other respectively with LED lighting device and PFC control circuit's input, and sampling circuit's input is connected to LED lighting device, and sampling circuit's output links to each other with PFC control circuit's feedback end, and PFC control circuit's output is connected to LED lighting device. The utility model saves the step-down conversion circuit in the traditional mode; therefore, the circuit is simplified, the number of components is reduced, the composition cost of related products is reduced, the reliability of the products and the power conversion efficiency (up to 98 percent) are improved, the related energy-saving products can be more energy-saving and cheaper, and the popularization of the related energy-saving products is promoted.
Description
Technical field
The utility model relates to a kind of illumination driving circuit, is specifically related to a kind of LED lighting device drive circuit.
Background technology
Because the operating voltage of monomer led light source is lower, the LED illumination before or the driving of indicating device are the modes that adopts low-voltage and high-current.Embodiment is: with after the series connection of many monomer led light sources again the mode of parallel connection or series-parallel connection be combined into the LED combined light source of operating voltage between 3-200V, re-use and isolate or the voltage-dropping type voltage changer of non-isolation drives.
The operating voltage of existing led light source is fallen (VF) and all can be raise along with the temperature of device and reduce, and the VF value has certain individual difference.In drive scheme before; The LED monomer of parallel connection is again arranged after a large amount of parallel connections or the series connection because the height of VF value and the individual difference of radiating condition, cause individuality or gone here and there by parallelly connected LED between current deviation bigger; In parallel circuits, the voltage on each device is identical; Because voltage can not change, the height of VF value and the individual difference of radiating condition can cause pressure drop individual electrorheological on the low side big, and its electrorheological are big, and it is big that power also can become; It is big that power becomes, and individual temperature will raise, and it is lower that the VF value can be fallen, and it is bigger that electric current can become; So vicious circle will inevitably reduce the working life of led light source assembly.In addition, a unbalanced luminous efficiency that also can reduce the LED lighting device of electric current!
Traditional low voltage light sources component driver; Comprise and adopt non-isolated buck driver and adopt the step-down drivers such as PFC (Power Factor Correction power factor correction)+PWM (Pulse Width Modulation pulse width modulation), PFC+LLC (resonant circuit) and isolation single-stage PFC of isolating interior; They all have two parts function at least usually, and promptly power factor emendation function and step-down current-limiting function are formed, and the circuit of power factor correction that it comprises does not possess accurate output current qualification ability.The weak point of this step-down drive pattern that generally uses is: component number is many; Implement complicated circuit; This certainly will cause, and the Related product cost is high, reliability is low and the low adverse consequencess such as (having only 60%-90% usually) of power supply conversion efficiency, has hindered popularizing of relevant energy-conserving product.
The utility model content
To the deficiency of prior art, the purpose of the utility model is intended to provide the LED lighting device drive circuit of a kind of low cost, high efficiency, high reliability.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of LED lighting device drive circuit; Its input links to each other with AC power; Output is connected to the LED lighting device, comprises current rectifying and wave filtering circuit, PFC control circuit, sample circuit, and the input of said current rectifying and wave filtering circuit links to each other with AC power; The output of current rectifying and wave filtering circuit links to each other respectively with the input of LED lighting device with the PFC control circuit; The input of sample circuit is connected to the LED lighting device, and the output of sample circuit links to each other with the feedback end of PFC control circuit, and the output of PFC control circuit is connected to the LED lighting device.
Said LED lighting device comprises a LED light fixture and the 2nd LED light fixture of serial connection, and a said LED light fixture and the 2nd LED light fixture are formed by the led light source of a plurality of serial connections.
Said current rectifying and wave filtering circuit comprises EMI filter circuit, rectification circuit, high-frequency filter circuit; EMI filter circuit, rectification circuit, high-frequency filter circuit link to each other successively; The input of EMI filter circuit links to each other with AC power, and the output of high-frequency filter circuit links to each other respectively with the input of LED lighting device with the PFC control circuit.
LED lighting device drive circuit further comprises safety and insurance circuit, and said safety and insurance circuit are connected between AC power and the EMI filter circuit.
LED lighting device drive circuit further comprises bypass diode D1, and the anode of said bypass diode D1 is connected to the output of high-frequency filter circuit, and the negative electrode of bypass diode D1 is connected to the LED lighting device.
Said PFC control circuit comprises the PFC control chip; The input of said PFC control chip links to each other with the output of high-frequency filter circuit; The feedback end of PFC control chip links to each other with the output of sample circuit, and the output of PFC control chip is connected to the LED lighting device.
The feedback end of said PFC control chip comprises pressure feedback port and current feedback terminal; Sample circuit comprises current sampling resistor R10, voltage sample resistance R 7, shunt resistance R9 and divider resistance R8; The input of said voltage sample resistance R 7 is connected to the negative electrode of bypass diode D1; The output of voltage sample resistance R 7 is connected to pressure feedback port, and the input of current sampling resistor R10 is connected to the LED lighting device, and the output of current sampling resistor R10 links to each other with current feedback terminal; The end of shunt resistance R9 is connected to the input of current sampling resistor R10; Other end ground connection, divider resistance R8 one end is connected to the output of voltage sample resistance R 7, other end ground connection.
LED lighting device drive circuit further comprises an output filter circuit; Said output filter circuit comprises capacitor C 7, switching tube Q1, diode D2; The positive pole of said capacitor C 7 is connected to the negative electrode of bypass diode D1, the minus earth of capacitor C 7, and the grid of switching tube Q1 is connected to the output of PFC control chip; The drain electrode of switching tube Q1 is connected to the anode of diode D2, and the negative electrode of diode D2 is connected to the negative electrode of bypass diode D1.
LED lighting device drive circuit further comprises PFC boost inductance L1; The end of said PFC boost inductance L1 is connected between the input of output and PFC control chip of high-frequency filter circuit, and the other end of PFC boost inductance L1 is connected in the positive pole of diode D2.
A kind of LED lighting device drive circuit that the utility model is set forth; Compared with prior art; Its beneficial effect is: the utility model drive circuit is brought up to the operating voltage of LED lighting device in the reasonable output voltage range of PFC control circuit, and adopts the PFC control circuit with output voltage and output current attributive function directly to drive.Save the step-down conversion circuit of traditional mode; Thereby simplified circuit, reduced component number, reduced the composition cost of Related product, and improved reliability of products and power supply conversion efficiency (can reach 98%), can make relevant energy-conserving product more energy-conservation, more cheap; Thereby promote popularizing of relevant energy-conserving product, because the present invention has improved conversion efficiency, caloric value will inevitably reduce, thereby its work temperature rise is reduced, and the temperature rise of power supply has reduced, and reliability and working life will improve.In addition; The present invention has changed the connected mode of LED lighting device; Make consumed power and the relation of temperature rise of led light source individuality in circuit become negative correlation, suppressed the individual temperature difference of LED lighting device, promoted the working life and the luminous efficiency of LED lighting device by positive correlation.
Description of drawings
Accompanying drawing 1 is the structured flowchart of a kind of LED lighting device of the utility model drive circuit;
Accompanying drawing 2 is the circuit theory diagrams of Fig. 1.
Embodiment
Below, in conjunction with accompanying drawing and embodiment, a kind of LED lighting device drive circuit of the utility model done further describing, so that clearerly understand the utility model technological thought required for protection.
Shown in Fig. 1 ~ 2, a kind of LED lighting device drive circuit, the input of drive circuit 1 links to each other with AC power 3, and drive circuit 1 output is connected to LED lighting device 2.Drive circuit 1 comprises current rectifying and wave filtering circuit, PFC control circuit 15, sample circuit 16; The input of current rectifying and wave filtering circuit links to each other with AC power 3; The output of current rectifying and wave filtering circuit links to each other respectively with the input of LED lighting device 2 with PFC control circuit 15; The input of sample circuit 16 is connected to LED lighting device 2, and the output of sample circuit 16 links to each other with the feedback end of PFC control circuit 15, and the output of PFC control circuit 15 is connected to LED lighting device 2.
LED lighting device 2 comprises a LED light fixture LED1 and the 2nd LED light fixture LED2 of serial connection, and a LED light fixture LED1 and the 2nd LED light fixture LED2 form by the led light source of a plurality of serial connections.Its operating voltage is divided into 2 kinds: one of which, operating voltage are DC190-220V, are applicable to the input voltage range of AC85-135V; Two, operating voltage is DC380-440V, can be used for the input voltage range of AC170-265V or AC85-265V.In the utility model preferred embodiment; The one LED light fixture LED1 and the 2nd LED light fixture LED2 all are to be the light sources that the high light efficiency white LED light source of 3.0-3.4V is in series by 64 VF values; Its operating voltage range is DC380-440V, is applicable to the input voltage range of AC170-265V or AC85-265V; In series circuit; Electric current on each device is identical, and the individual difference for by the height and the radiating condition of VF value causes pressure drop individuality on the low side; Because electric current can not change; Its power consumption can diminish because the VF value is low, has become the benign cycle opposite with parallel circuits, and this will inevitably improve the overall operation life-span of led light source assembly.
Current rectifying and wave filtering circuit comprises EMI filter circuit 12, rectification circuit 13, high-frequency filter circuit 14; EMI filter circuit 12, rectification circuit 13, high-frequency filter circuit 14 link to each other successively; The input of EMI filter circuit 12 links to each other with AC power 3, and the output of high-frequency filter circuit 14 links to each other respectively with the input of LED lighting device 2 with PFC control circuit 15.
EMI filter circuit 12 is made up of with C2, common mode inductance L3 X capacitor C 1, and rectification circuit 13 adopts rectifier bridge BR1.X capacitor C 1, C2 and common mode inductance L3 are used for the EMI filter function, and rectifier bridge BR1 is a full-bridge rectifier, are used for converting electric main to pulsating dc voltage, and above element meets the electromagnetic compatibility requirement and accomplishes rectification function in order to satisfy Related product.The CBB of differential mode inductance L2, low capacity (polyethylene) capacitor C 3 constitutes high-frequency filter circuit 14 with C4, in order to elimination high frequency voltage electric current, guarantees that Related product meets electromagnetic compatibility requirements.
Safety and insurance circuit 11 are connected between AC power 3 and the EMI filter circuit 12.Safety and insurance circuit 11 are made up of protective tube F1, negative tempperature coefficient thermistor RT1, piezo-resistance R1, conventional, electric-resistance R2; Wherein, Protective tube F1 is used for the circuit abnormality protection, and negative tempperature coefficient thermistor RT1 is used to reduce the surge current of powered on moment, and piezo-resistance R1 is used to prevent that line surge voltage (like lightning induction) from damaging product; Conventional, electric-resistance R2 be used to release the outage after remain in the voltage on the X electric capacity, meet the requirement of safety standard to guarantee Related product.
The anode of bypass diode D1 is connected to the output of high-frequency filter circuit, and the negative electrode of bypass diode D1 is connected to LED lighting device 2.Bypass diode D1 is used to the surge current that produces under powered on moment and the abnormality bypass channel is provided, and is not damaged by surge current to protect other key elements.
The feedback end of PFC control chip IC1 comprises pressure feedback port (second pin of PFC control chip IC1) and current feedback terminal (first pin of PFC control chip IC1); Sample circuit 16 comprises current sampling resistor R10, voltage sample resistance R 7, shunt resistance R9 and divider resistance R8; The input of voltage sample resistance R 7 is connected to the negative electrode of bypass diode D1; The output of voltage sample resistance R 7 is connected to pressure feedback port, and the input of current sampling resistor R10 is connected to the LED lighting device, and the output of current sampling resistor R10 links to each other with current feedback terminal; The end of shunt resistance R9 is connected to the input of current sampling resistor R10; Other end ground connection, divider resistance R8 one end is connected to the output of voltage sample resistance R 7, other end ground connection.Certainly, the requirement of the PFC control chip IC1 that sample circuit 16 also can be selected for use according to PFC control circuit 15 through the synthetic conversion of certain rule, and provides the output voltage that samples and output current signal coherent signal to PFC control circuit 15; Thereby control output voltage and output current are to guarantee that high working voltage LED lighting device 2 can operate as normal.
The end of PFC boost inductance L1 is connected between the input of output and PFC control chip of high-frequency filter circuit, and the other end of PFC boost inductance L1 is connected in the positive pole of diode D2.The self-induction that PFC boost inductance L1 is used for power factor correction is boosted, and magnetic reset signal and accessory power supply voltage is provided for relevant control circuit.
The operation principle of drive circuit 1:
(1) powers on
After powering on; AC power 3 is from L, the input of N interface; After containing safety that elements such as protective tube F1, thermistor RT1 form and insurance circuit 11, EMI filter circuit 12, rectification circuit 13, high-frequency filter circuit 14; Be converted into pulsating dc voltage VD+, this voltage VD+ produces an initial current by thermistor RT1 restriction through diode D1 and gives capacitor C 7 chargings, produces direct voltage VH+; This voltage VH+ will rise to the peak value near input voltage very soon, but also be not enough to drive lighting device.
(2) start
Voltage VD+ produces boost voltage VCC for capacitor C 5 chargings via resistance R 3; When voltage VCC reaches the starting resistor of PFC control chip IC1; PFC control chip IC1 starts, and the output control switch pipe Q1 through PFC control chip IC1 does the HF switch action, thereby produces pulse voltage VSW; This voltage gives capacitor C 7 chargings through diode D2, and voltage VH+ is raise.The induced potential that pulse voltage VSW produces on PFC boost inductance L1 produces voltage VF via the auxiliary winding above it; Voltage VF provides additional for the voltage VCC on the capacitor C 5 through capacitor C 6, resistance R 4 and diode D3, D4 voltage multiplying rectifier, makes voltage VCC can continue to satisfy the operate as normal needs of PFC control chip IC1.
(3) voltage stabilizing
The output voltage control of this instance; Be the output voltage sampled signal voltage OVS that produces through resistance R 7, R8 dividing potential drop by voltage VH+; The pressure feedback port of voltage OVS input PFC control chip IC1; Relatively produce voltage error signal via PFC control chip IC1 is inner with its reference voltage, the switching time of control switch pipe Q1, thus reach the purpose of controlling and adjusting output voltage.
(4) constant current
Controlled voltage VH+ produces the loop through LED lighting device, resistance R 9 and ground wire GND; The electric current that this loop the produces resistance R 9 of flowing through produces current voltage drop; This pressure drop produces output current sampled signal voltage OCS through resistance R 10, and the current feedback terminal of voltage OCS input PFC control chip IC1 relatively produces current error signal via PFC control chip IC1 is inner with its reference voltage; This signal is participated in the switching time of control switch pipe Q1; Output voltage V H+ has also been adjusted in control, and the loop current that is produced by voltage VH+ also is under control and adjusts, thereby reaches the effect of the current constant of the LED lighting device of flowing through.
(5) power factor correction
The switching tube Q1 that flows through produces main circuit current signal voltage CS on resistance R 6, voltage CS is imported into PFC control chip IC1 the 4th pin; The voltage VF that comprises input voltage VD+ information and magnetic reset information that produces of the auxiliary winding of PFC boost inductance L1 in addition; Input PFC control chip IC1 the 5th pin after resistance R 5 samplings; By producing pfc signal after the PFC control chip IC1 inter-process; This signal is participated in the switching time of control switch pipe Q1, through to the switching tube Q1 control of switching time, reaches the purpose of power factor correction.
For a person skilled in the art, can make other various corresponding changes and distortion, and these all changes and distortion should belong within the protection range of the utility model claim all according to the technical scheme and the design of above description.
Claims (9)
1. LED lighting device drive circuit; Its input links to each other with AC power, and output is connected to the LED lighting device, it is characterized in that; Comprise current rectifying and wave filtering circuit, PFC control circuit, sample circuit; The input of said current rectifying and wave filtering circuit links to each other with AC power, and the output of current rectifying and wave filtering circuit links to each other respectively with the input of LED lighting device with the PFC control circuit, and the input of sample circuit is connected to the LED lighting device; The output of sample circuit links to each other with the feedback end of PFC control circuit, and the output of PFC control circuit is connected to the LED lighting device.
2. LED lighting device drive circuit as claimed in claim 1; It is characterized in that; Said LED lighting device comprises a LED light fixture and the 2nd LED light fixture of serial connection, and a said LED light fixture and the 2nd LED light fixture are formed by the led light source of a plurality of serial connections.
3. LED lighting device drive circuit as claimed in claim 1; It is characterized in that; Said current rectifying and wave filtering circuit comprises EMI filter circuit, rectification circuit, high-frequency filter circuit; EMI filter circuit, rectification circuit, high-frequency filter circuit link to each other successively, and the input of EMI filter circuit links to each other with AC power, and the output of high-frequency filter circuit links to each other respectively with the input of LED lighting device with the PFC control circuit.
4. LED lighting device drive circuit as claimed in claim 3 is characterized in that LED lighting device drive circuit further comprises safety and insurance circuit, and said safety and insurance circuit are connected between AC power and the EMI filter circuit.
5. LED lighting device drive circuit as claimed in claim 3; It is characterized in that; LED lighting device drive circuit further comprises bypass diode D1, and the anode of said bypass diode D1 is connected to the output of high-frequency filter circuit, and the negative electrode of bypass diode D1 is connected to the LED lighting device.
6. LED lighting device drive circuit as claimed in claim 5; It is characterized in that; Said PFC control circuit comprises the PFC control chip; The input of said PFC control chip links to each other with the output of high-frequency filter circuit, and the feedback end of PFC control chip links to each other with the output of sample circuit, and the output of PFC control chip is connected to the LED lighting device.
7. LED lighting device drive circuit as claimed in claim 6; It is characterized in that the feedback end of said PFC control chip comprises pressure feedback port and current feedback terminal, sample circuit comprises current sampling resistor R10, voltage sample resistance R 7, shunt resistance R9 and divider resistance R8; The input of said voltage sample resistance R 7 is connected to the negative electrode of bypass diode D1; The output of voltage sample resistance R 7 is connected to pressure feedback port, and the input of current sampling resistor R10 is connected to the LED lighting device, and the output of current sampling resistor R10 links to each other with current feedback terminal; The end of shunt resistance R9 is connected to the input of current sampling resistor R10; Other end ground connection, divider resistance R8 one end is connected to the output of voltage sample resistance R 7, other end ground connection.
8. LED lighting device drive circuit as claimed in claim 7; It is characterized in that; LED lighting device drive circuit further comprises an output filter circuit, and said output filter circuit comprises capacitor C 7, switching tube Q1, diode D2, and the positive pole of said capacitor C 7 is connected to the negative electrode of bypass diode D1; The minus earth of capacitor C 7; The grid of switching tube Q1 is connected to the output of PFC control chip, and the drain electrode of switching tube Q1 is connected to the anode of diode D2, and the negative electrode of diode D2 is connected to the negative electrode of bypass diode D1.
9. LED lighting device drive circuit as claimed in claim 8; It is characterized in that; LED lighting device drive circuit further comprises PFC boost inductance L1; The end of said PFC boost inductance L1 is connected between the input of output and PFC control chip of high-frequency filter circuit, and the other end of PFC boost inductance L1 is connected in the positive pole of diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220007395 CN202425146U (en) | 2012-01-06 | 2012-01-06 | A driving circuit for an LED lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220007395 CN202425146U (en) | 2012-01-06 | 2012-01-06 | A driving circuit for an LED lighting device |
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| Publication Number | Publication Date |
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| CN202425146U true CN202425146U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220007395 Expired - Lifetime CN202425146U (en) | 2012-01-06 | 2012-01-06 | A driving circuit for an LED lighting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103025009A (en) * | 2012-11-29 | 2013-04-03 | 余姚亿威电子科技有限公司 | Light-emitting diode (LED) driving control circuit |
| CN104837268A (en) * | 2015-05-14 | 2015-08-12 | 深圳市康奈可科技有限公司 | High-efficiency LED fluorescent lamp driving apparatus |
| CN104993728A (en) * | 2015-07-07 | 2015-10-21 | 安徽继远电网技术有限责任公司 | Intelligent high-frequency switching power source module applied to substation power source system |
| WO2023060411A1 (en) * | 2021-10-11 | 2023-04-20 | 深圳技术大学 | Floodlight system for anechoic room or shielded room |
-
2012
- 2012-01-06 CN CN 201220007395 patent/CN202425146U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103025009A (en) * | 2012-11-29 | 2013-04-03 | 余姚亿威电子科技有限公司 | Light-emitting diode (LED) driving control circuit |
| CN103025009B (en) * | 2012-11-29 | 2015-09-09 | 余姚亿威电子科技有限公司 | A kind of LED Drive and Control Circuit |
| CN104837268A (en) * | 2015-05-14 | 2015-08-12 | 深圳市康奈可科技有限公司 | High-efficiency LED fluorescent lamp driving apparatus |
| CN104993728A (en) * | 2015-07-07 | 2015-10-21 | 安徽继远电网技术有限责任公司 | Intelligent high-frequency switching power source module applied to substation power source system |
| WO2023060411A1 (en) * | 2021-10-11 | 2023-04-20 | 深圳技术大学 | Floodlight system for anechoic room or shielded room |
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Owner name: CHEN JINGZHAN Free format text: FORMER OWNER: GUANGZHOU LONGDU ELECTRONICS CO., LTD. Effective date: 20150604 |
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Free format text: CORRECT: ADDRESS; FROM: 511447 GUANGZHOU, GUANGDONG PROVINCE TO: 510240 GUANGZHOU, GUANGDONG PROVINCE |
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Effective date of registration: 20150604 Address after: 510240 Guangdong Province, Haizhuqu District, Jiangnan Avenue, No. 100 in the middle of the building, room No. 1610, building No. Patentee after: Chen Jingzhan Address before: On the north side of the Yangtze River Road Panyu District Shilou town Chigang village of Guangzhou city of Guangdong Province in 511447 Patentee before: Guangzhou Longdo Electronics Co., Ltd. |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160612 Address after: 3, building 523000, building 1, innovation science park, Songshan hi tech Industrial Development Zone, Dongguan, Guangdong Province, China, 313A Patentee after: Dongguan Changda Traffic Technology Co. Ltd. Address before: 510240 Guangdong Province, Haizhuqu District, Jiangnan Avenue, No. 100 in the middle of the building, room No. 1610, building No. Patentee before: Chen Jingzhan |
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| CX01 | Expiry of patent term |
Granted publication date: 20120905 |
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